It doesn't really matter..to me at least. I use a Garmin ETREX 20. I've had it for years and use it for hiking, kayaking, and in recent years cycling. It's small and mounts on the bars. Works perfect, waterproof, long battery life, easy to toggle through various screens. I have it set up to show the track I'm following as well as speed, miles, avg speed, and direction NSEW. I've looked at regular cycling GPS units. They have lots of additional bells and whistles and connectivity to other apps to track who is king of some mountain......none of which I care about in the least. As long as I know where I am and where I'm going..I'm good.